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Loans and Allowance for Loan Losses - Schedule of Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Balance	$ 5,938	$ 5,644	$ 5,765	$ 5,459
Charge-offs	(134)	(73)	(183)	(106)
Recoveries	62	14	84	32
Provision for loan losses	400	250	600	450
Balance	6,266	5,835	6,266	5,835
Individually evaluated for loss					$ 651	$ 310
Collectively evaluated for loss					5,615	5,455
Total	6,266	5,835	6,266	5,835	6,266	5,765
Individually evaluated for loss					11,025	8,691
Collectively evaluated for loss					505,337	486,556
Loans and Leases Receivable, Gross, Total					516,362	495,247
One-to-Four Family Residential Real Estate Loans [Member]
Balance	474	477	449	542
Charge-offs	(41)		(41)
Recoveries		1	1	2
Provision for loan losses	8	(39)	32	(105)
Balance	441	439	441	439
Individually evaluated for loss					72	100
Collectively evaluated for loss					369	349
Total	441	439	449	542	441	449
Individually evaluated for loss					1,372	623
Collectively evaluated for loss					134,333	136,272
Loans and Leases Receivable, Gross, Total					135,705	136,895
Construction and Land Loan [Member]
Balance	156	121	168	181
Charge-offs
Recoveries
Provision for loan losses	99	(12)	87	(72)
Balance	255	109	255	109
Individually evaluated for loss					191	103
Collectively evaluated for loss					64	65
Total	255	109	168	181	255	168
Individually evaluated for loss					2,049	1,808
Collectively evaluated for loss					18,001	18,275
Loans and Leases Receivable, Gross, Total					20,050	20,083
Commercial Real Estate Loans [Member]
Balance	1,871	1,562	1,686	1,540
Charge-offs
Recoveries				1
Provision for loan losses	(113)	(96)	72	(75)
Balance	1,758	1,466	1,758	1,466
Individually evaluated for loss					274	67
Collectively evaluated for loss					1,484	1,619
Total	1,758	1,466	1,686	1,540	1,758	1,686
Individually evaluated for loss					5,248	3,912
Collectively evaluated for loss					134,659	135,055
Loans and Leases Receivable, Gross, Total					139,907	138,967
Commercial Loans [Member]
Balance	1,165	1,484	1,051	1,226
Charge-offs	(40)	(29)	(40)	(29)
Recoveries	50	1	51	2
Provision for loan losses	229	237	342	494
Balance	1,404	1,693	1,404	1,693
Individually evaluated for loss					114	27
Collectively evaluated for loss					1,290	1,024
Total	1,404	1,693	1,051	1,226	1,404	1,051
Individually evaluated for loss					1,700	1,528
Collectively evaluated for loss					92,679	72,761
Loans and Leases Receivable, Gross, Total					94,379	74,289
Agriculture Loans [Member]
Balance	2,128	1,867	2,238	1,812
Charge-offs
Recoveries
Provision for loan losses	132	138	22	193
Balance	2,260	2,005	2,260	2,005
Individually evaluated for loss						13
Collectively evaluated for loss					2,260	2,225
Total	2,260	2,005	2,238	1,812	2,260	2,238
Individually evaluated for loss					560	717
Collectively evaluated for loss					98,833	95,915
Loans and Leases Receivable, Gross, Total					99,393	96,632
Municipal Loans [Member]
Balance	7	7	7	8
Charge-offs
Recoveries			6	2
Provision for loan losses			(6)	(3)
Balance	7	7	7	7
Individually evaluated for loss
Collectively evaluated for loss					7	7
Total	7	7	7	8	7	7
Individually evaluated for loss					58	58
Collectively evaluated for loss					2,729	2,895
Loans and Leases Receivable, Gross, Total					2,787	2,953
Consumer Loans [Member]
Balance	137	126	166	150
Charge-offs	(53)	(44)	(102)	(77)
Recoveries	12	12	26	25
Provision for loan losses	45	22	51	18
Balance	141	116	141	116
Individually evaluated for loss
Collectively evaluated for loss					141	166
Total	$ 141	$ 116	$ 166	$ 150	141	166
Individually evaluated for loss					38	45
Collectively evaluated for loss					24,103	25,383
Loans and Leases Receivable, Gross, Total					$ 24,141	$ 25,428

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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